Future value $($with changing years$).$ Dixie Bank offers a certificate of deposit with an option to select your own investment period. Jonathan has $$7,000$ for his CD

investment. If the bank is offering a $6\%$ interest rate, compounded annually, how much will the CD be worth at maturity if Jonathan picks a

a$.$ two$-$year investment period?

b$.$ five$-$year investment period?

c$.$ eight$-$year investment period?

d$.$ fifteen$-$year investment period?

a$.$ How much will the $$7,000CD$ investment at $6\%$ interest rate be worth at maturity if Jonathan picks a $2-$year investment period?

$($Round to the nearest cent.$)$